Simultaneous chlorination and sulphation of calcined limestone

Masahiko Matsukata, K. Takeda, T. Miyatani, K. Ueyama

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

In order to analyze HCl and SO2 retention in fluidized bed combustors of coal and wastes, chlorination and sulphation of calcined limestone were investigated at 1023 K and atmospheric pressure using thermogravimetry. The rate of chlorination of calcined limestone slightly depended on its particle size and was kept almost constant against the progress of chlorination. In contrast, the rate of sulphation increased with decreasing particle size and steeply decreased with the progress of sulphation as commonly reported. It was found that the sulphation was markedly accelerated in the presence of HCl. Such acceleration of sulphation was remarkable for larger limestone. The level of conversion of CaO to (CaSO4 + CaCl2) always approached 100% in the simultaneous absorption of HCl and SO2. It was observed by SEM that in the chlorination a number of spherical aggregates and large voids were formed on the surface of limestone and that large aggregates with very flat surface and large voids have been formed in the course of the simultaneous chlorination and sulphation. These chlorination behavior and the acceleration of SO2 absorption in the presence of HCl can be due both to the formation of a mobile Cl- ion-containing phase and to the formation of voids playing a role of the diffusion paths for HCl and SO2 toward the interior of a limestone particle. Melting of a eutectic mixture of CaCl2 and CaSO4 might largely contribute to the promotion of SO2 absorption in the case of simultaneous absorption of HCl and SO2.

Original languageEnglish
Pages (from-to)2529-2534
Number of pages6
JournalChemical Engineering Science
Volume51
Issue number11
Publication statusPublished - 1996
Externally publishedYes

Fingerprint

Calcium Carbonate
Chlorination
Limestone
Particle size
Fluidized bed combustors
Coal
Eutectics
Atmospheric pressure
Thermogravimetric analysis
Melting
Ions
Scanning electron microscopy

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Matsukata, M., Takeda, K., Miyatani, T., & Ueyama, K. (1996). Simultaneous chlorination and sulphation of calcined limestone. Chemical Engineering Science, 51(11), 2529-2534.

Simultaneous chlorination and sulphation of calcined limestone. / Matsukata, Masahiko; Takeda, K.; Miyatani, T.; Ueyama, K.

In: Chemical Engineering Science, Vol. 51, No. 11, 1996, p. 2529-2534.

Research output: Contribution to journalArticle

Matsukata, M, Takeda, K, Miyatani, T & Ueyama, K 1996, 'Simultaneous chlorination and sulphation of calcined limestone', Chemical Engineering Science, vol. 51, no. 11, pp. 2529-2534.
Matsukata, Masahiko ; Takeda, K. ; Miyatani, T. ; Ueyama, K. / Simultaneous chlorination and sulphation of calcined limestone. In: Chemical Engineering Science. 1996 ; Vol. 51, No. 11. pp. 2529-2534.
@article{d9e4989ef20f46ecb7127c694f382dd9,
title = "Simultaneous chlorination and sulphation of calcined limestone",
abstract = "In order to analyze HCl and SO2 retention in fluidized bed combustors of coal and wastes, chlorination and sulphation of calcined limestone were investigated at 1023 K and atmospheric pressure using thermogravimetry. The rate of chlorination of calcined limestone slightly depended on its particle size and was kept almost constant against the progress of chlorination. In contrast, the rate of sulphation increased with decreasing particle size and steeply decreased with the progress of sulphation as commonly reported. It was found that the sulphation was markedly accelerated in the presence of HCl. Such acceleration of sulphation was remarkable for larger limestone. The level of conversion of CaO to (CaSO4 + CaCl2) always approached 100{\%} in the simultaneous absorption of HCl and SO2. It was observed by SEM that in the chlorination a number of spherical aggregates and large voids were formed on the surface of limestone and that large aggregates with very flat surface and large voids have been formed in the course of the simultaneous chlorination and sulphation. These chlorination behavior and the acceleration of SO2 absorption in the presence of HCl can be due both to the formation of a mobile Cl- ion-containing phase and to the formation of voids playing a role of the diffusion paths for HCl and SO2 toward the interior of a limestone particle. Melting of a eutectic mixture of CaCl2 and CaSO4 might largely contribute to the promotion of SO2 absorption in the case of simultaneous absorption of HCl and SO2.",
author = "Masahiko Matsukata and K. Takeda and T. Miyatani and K. Ueyama",
year = "1996",
language = "English",
volume = "51",
pages = "2529--2534",
journal = "Chemical Engineering Science",
issn = "0009-2509",
publisher = "Elsevier BV",
number = "11",

}

TY - JOUR

T1 - Simultaneous chlorination and sulphation of calcined limestone

AU - Matsukata, Masahiko

AU - Takeda, K.

AU - Miyatani, T.

AU - Ueyama, K.

PY - 1996

Y1 - 1996

N2 - In order to analyze HCl and SO2 retention in fluidized bed combustors of coal and wastes, chlorination and sulphation of calcined limestone were investigated at 1023 K and atmospheric pressure using thermogravimetry. The rate of chlorination of calcined limestone slightly depended on its particle size and was kept almost constant against the progress of chlorination. In contrast, the rate of sulphation increased with decreasing particle size and steeply decreased with the progress of sulphation as commonly reported. It was found that the sulphation was markedly accelerated in the presence of HCl. Such acceleration of sulphation was remarkable for larger limestone. The level of conversion of CaO to (CaSO4 + CaCl2) always approached 100% in the simultaneous absorption of HCl and SO2. It was observed by SEM that in the chlorination a number of spherical aggregates and large voids were formed on the surface of limestone and that large aggregates with very flat surface and large voids have been formed in the course of the simultaneous chlorination and sulphation. These chlorination behavior and the acceleration of SO2 absorption in the presence of HCl can be due both to the formation of a mobile Cl- ion-containing phase and to the formation of voids playing a role of the diffusion paths for HCl and SO2 toward the interior of a limestone particle. Melting of a eutectic mixture of CaCl2 and CaSO4 might largely contribute to the promotion of SO2 absorption in the case of simultaneous absorption of HCl and SO2.

AB - In order to analyze HCl and SO2 retention in fluidized bed combustors of coal and wastes, chlorination and sulphation of calcined limestone were investigated at 1023 K and atmospheric pressure using thermogravimetry. The rate of chlorination of calcined limestone slightly depended on its particle size and was kept almost constant against the progress of chlorination. In contrast, the rate of sulphation increased with decreasing particle size and steeply decreased with the progress of sulphation as commonly reported. It was found that the sulphation was markedly accelerated in the presence of HCl. Such acceleration of sulphation was remarkable for larger limestone. The level of conversion of CaO to (CaSO4 + CaCl2) always approached 100% in the simultaneous absorption of HCl and SO2. It was observed by SEM that in the chlorination a number of spherical aggregates and large voids were formed on the surface of limestone and that large aggregates with very flat surface and large voids have been formed in the course of the simultaneous chlorination and sulphation. These chlorination behavior and the acceleration of SO2 absorption in the presence of HCl can be due both to the formation of a mobile Cl- ion-containing phase and to the formation of voids playing a role of the diffusion paths for HCl and SO2 toward the interior of a limestone particle. Melting of a eutectic mixture of CaCl2 and CaSO4 might largely contribute to the promotion of SO2 absorption in the case of simultaneous absorption of HCl and SO2.

UR - http://www.scopus.com/inward/record.url?scp=0029674267&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029674267&partnerID=8YFLogxK

M3 - Article

VL - 51

SP - 2529

EP - 2534

JO - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

IS - 11

ER -